Gallstones can be categorized into cholesterol stones, bile pigment stones and mixed stones according to their formation components. 1, cholesterol stones: bile component “cholesterol” is usually in a dissolved state, if due to some reasons lead to elevated cholesterol content in the gallbladder will precipitate the formation of crystals – cholesterol crystals. The crystals can adhere to the wall of the gallbladder, and can also be rolled and adhered to the gallbladder, gradually grow up, and then form stones. 2, bile pigment stones: the main component of bile pigment stones is calcium bilirubinate, which is coagulated by the matrix of glycoprotein. Under normal circumstances, the generation and dissolution of calcium bilirubinate precipitates are in a balanced state. If the bile is supersaturated with calcium bilirubinate, precipitate production results. Biliary obstruction and biliary tract infection are the main triggers for the formation of bile pigment stones. 3, mixed stones: mixed stones is the most common cholelithiasis, stones are often more than one, the diameter can be from small sand grains to 1cm, mixed stones occur in the gallbladder, the formation mechanism is complex. Different gallstones have different shapes and colors due to their different composition, location of formation and time of growth. 1.Observe the size: big ones are like eggs, small ones are like mud and sand. 2, depending on its shape: round, oval, polygonal, irregular or sandy. 3, study its classification: according to the different parts of the growth of stones can be divided into gallbladder stones, intrahepatic bile duct stones and extrahepatic bile duct stones. Doctor’s note: Long-term suffering from gallstones will not only jeopardize our health, but also have a great impact on our lives. Therefore, patients with gallstones must go to regular hospitals for treatment as soon as possible.